NEC Commercial Electrical Practice Test

What is the purpose of the orange triangle on a receptacle?

1. Indicates a higher voltage

2. Identifies it as isolated grounding

3. Marks it as for outdoor use

4. Denotes a special circuit

The correct answer is: Identifies it as isolated grounding

The orange triangle on a receptacle is specifically used to identify it as an isolated grounding receptacle. Isolated grounding receptacles are designed to provide both a ground and a separate grounding conductor that is isolated from the equipment ground. This is particularly important in settings where sensitive electronic equipment is used, as it helps to protect against electrical noise and ensures better performance. Using isolated grounding helps reduce the risk of interference that could affect device operation, making it crucial in environments like data centers, laboratories, or medical facilities. The other options, while addressing various aspects of electrical systems, do not pertain to the specific function of the orange triangle. High voltage indicators, outdoor use markers, and special circuit distinctions are all conveyed through different types of labeling or standards, but they do not use the orange triangle for identification.